diff --git a/fdroidserver/metadata.py b/fdroidserver/metadata.py
index 8c9aa6d7..7862b8f1 100644
--- a/fdroidserver/metadata.py
+++ b/fdroidserver/metadata.py
@@ -429,7 +429,7 @@ valuetypes = {
                    ["ArchivePolicy"]),
 
     FieldValidator("Anti-Feature",
-                   r'^(Ads|Tracking|NonFreeNet|NonFreeDep|NonFreeAdd|UpstreamNonFree|NonFreeAssets|KnownVuln|ApplicationDebuggable)$',
+                   r'^(Ads|Tracking|NonFreeNet|NonFreeDep|NonFreeAdd|UpstreamNonFree|NonFreeAssets|KnownVuln|ApplicationDebuggable|NoSourceSince)$',
                    ["AntiFeatures"]),
 
     FieldValidator("Auto Update Mode",
@@ -993,6 +993,9 @@ def parse_metadata(metadatapath, check_vcs=False, refresh=True):
 
     post_metadata_parse(app)
 
+    if app.NoSourceSince:
+        app.AntiFeatures.append('NoSourceSince')
+
     if not app.id:
         if app.builds:
             build = app.builds[-1]